'''Pain''' is a distressing feeling often caused by intense or damaging stimuli, such as stubbing a toe, burning a finger, putting alcohol on a cut, and bumping the "ulnar nerve|funny bone
[The examples represent respectively the three classes of #Nociceptive|nociceptive pain - mechanical, thermal and chemical - and #Neuropathic|neuropathic pain.]
Because it is a complex, subjective phenomenon, defining pain has been a challenge. The International Association for the Study of Pain
's widely used definition states: "Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage."
[ Derived from ]
In medical diagnosis, pain is a symptom
Pain motivates the individual to withdraw from damaging situations, to protect a damaged body part while it heals, and to avoid similar experiences in the future.